<template>
	<view class="uni-numbox">
		<view class="uni-numbox-minus" @click="_calcValue('subtract')">
			<text class="coolc icon-jianhao" :class="minDisabled?'uni-numbox-disabled': ''" ></text>
		</view>
		<input class="uni-numbox-value" type="number" :disabled="disabled" :value="inputValue" @blur="_onBlur">
		<view class="uni-numbox-plus" @click="_calcValue('add')">
			<text class="coolc icon-jiahao" :class="maxDisabled?'uni-numbox-disabled': ''" ></text>
		</view>
	</view>
</template>
<script>
	export default {
		name: 'uni-number-box',
		props: {
			isMax: {
				type: Boolean,
				default: false
			},
			isMin: {
				type: Boolean,
				default: false
			},
			index: {
				type: Number,
				default: 0
			},
			value: {
				type: Number,
				default: 0
			},
			min: {
				type: Number,
				default: -Infinity
			},
			max: {
				type: Number,
				default: Infinity
			},
			step: {
				type: Number,
				default: 1
			},
			disabled: {
				type: Boolean,
				default: false
			}
		},
		data() {
			return {
				inputValue: this.value,
				minDisabled: false,
				maxDisabled: false
			}
		},
		created(){
			this.maxDisabled = this.isMax;
			this.minDisabled = this.isMin;
		},
		computed: {

		},
		watch: {
			inputValue(number) {
				const data = {
					number: number,
					index: this.index
				}
				this.$emit('eventChange', data);
			}
		},
		methods: {
			_calcValue(type) {
				const scale = this._getDecimalScale();
				let value = this.inputValue * scale;
				let newValue = 0;
				let step = this.step * scale;
				
				if(type === 'subtract'){
					newValue = value - step;
					if (newValue <= this.min){
						this.minDisabled = true;
					}
					if(newValue < this.min){
						newValue = this.min
					}
					if(newValue < this.max && this.maxDisabled === true){
						this.maxDisabled = false;
					}
				}else if(type === 'add'){
					newValue = value + step;
					if (newValue >= this.max){
						this.maxDisabled = true;
					}
					if(newValue > this.max){
						newValue = this.max
					}
					if(newValue > this.min && this.minDisabled === true){
						this.minDisabled = false;
					}
				}
				if(newValue === value){
					return;
				}
				this.inputValue = newValue / scale;
			},
			_getDecimalScale() {
				let scale = 1;
				// 浮点型
				if (~~this.step !== this.step) {
					scale = Math.pow(10, (this.step + '').split('.')[1].length);
				}
				return scale;
			},
			_onBlur(event) {
				let value = event.detail.value;
				if (!value) {
					this.inputValue = 0;
					return
				}
				value = +value;
				if (value > this.max) {
					value = this.max;
				} else if (value < this.min) {
					value = this.min
				}

				this.inputValue = value
			}
		}
	}
</script>
<style>
.uni-numbox { position:absolute; left:30upx; bottom:0; display:flex; justify-content:flex-start; align-items:center; width:200upx; height:70upx; background:#ffffff; border:1px solid #eee;	}
.uni-numbox-minus,.uni-numbox-plus { margin:0; width:55upx; height:100%; line-height:70upx; text-align:center; position:relative; }
.uni-numbox-minus .coolc,.uni-numbox-plus .coolc{ font-size:30upx; color:#555; }
.uni-numbox-minus { border-right:none; border-top-left-radius:6upx; border-bottom-left-radius:6upx; }
.uni-numbox-plus { border-left:none; border-top-right-radius:6upx; border-bottom-right-radius:6upx; }
.uni-numbox-value { position:relative; background-color:#ffffff; border:1px solid #eeeeee; width:90upx; height:70upx; text-align:center; padding:0; font-size:30upx; }
.uni-numbox-disabled.coolc { color:#d6d6d6; }
</style>